How to convert list to comma separated string using java 8

• Howto convert list to comma separated string using java 8 stream.
• By using collect() method of stream  and Collectors.join(",") method we can convert list to comma separated string in java 8.
• Java Example program to convert list of strings to comma separated string.

#1: Java Example program to convert list to comma separated string using java 8 stream.

1. package com.instanceofjava;
2. import java.util.ArrayList;
3. import java.util.Arrays;
4. import java.util.stream.Collectors;
5. 
   
6. /**
7.  * @author www.Instanceofjava.com
8.  * @category interview programming questions
9.  * 
10.  * Description: convert ArrayList of strings tp comma separated string using java 8
11.  *
12.  */
13. public class ArrayToString {
14. 
    
15. public static void main(String[] args) {
17. ArrayList<String> colours =new ArrayList<>();
19. colours.add("Red");
20. colours.add("Green");
21. colours.add("Orange");
23.    String result = colours.stream().collect(Collectors.joining(","));
24.    System.out.println(result);
25.    
26. }
27. }

Output:

1. Red,Green,Orange